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Note 9 - Segment Information (Details) - Identifiable Assets (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Identifiable assets:    
Identifiable assets $ 39,745us-gaap_Assets $ 38,738us-gaap_Assets
Thermal Products [Member]    
Identifiable assets:    
Identifiable assets 14,899us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= intt_ThermalProductsMember		 26,211us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= intt_ThermalProductsMember
Mechanical Products [Member]    
Identifiable assets:    
Identifiable assets 21,413us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= intt_MechanicalProductsMember		 7,801us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= intt_MechanicalProductsMember
Electrical Products [Member]    
Identifiable assets:    
Identifiable assets $ 3,433us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= intt_ElectricalProductsMember		 $ 4,726us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= intt_ElectricalProductsMember